public RankCreateValidator(IRankRepository rankRepository)
{
RuleFor(r => r.HigherRankId)
.MustAsync(async(id, cancelation) =>
{
return(id != (await rankRepository.GetMaxIdAsync()) + 1);
}).When(r => r.HigherRankId != null).WithMessage("{PropertyName} must be other rank.");
RuleFor(r => r.Name)
.NotEmpty().WithMessage("{PropertyName} is required.");
}